Follow in Silence bottles have been found all over the island. | Jaume Morey

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Bottles containing a mysterious red substance and a label saying "Sequiu en Silencio" or "Follow In Silence" have started to appear in towns all over Majorca.

Photographs of bottles in Palma, Andratx, Artà, Binissalem and Bunyola have been uploaded to social media websites and although no-one has claimed responsibility, all of the people who published them are committed feminists.